To print a photograph with a lamp giving light intensit

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Uploaded: 28.01.2017
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Description

To print a photograph with a lamp giving light intensity I1 = kd and 60 at a distance r1 = 1 m, the exposure required t = 2 s. What need exposure for printing the same image with the lamp I2 = 40 cd at a distance r2 = 2 m from the picture?

Additional information

Task 40930. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
If you have any questions about the decision to write. I try to help.

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